Process of purifying illuminating gas



May 29 w27.,

E J. BRADY PROCESSl QHv PURIFYING. ILLUMINATING GAS PURIFLED @is Fild Aug. ze. 1921 Pon/DERED HYDRA TED IRON OKIDE PUR: Faso ILLuMlmA-ruueons GAS ArraA/EK Patented May 3, 1927.

UNiTEDsTArEs param ortica.

EDWARD J'. BRADY, 0F PHILADELPHIA, PENNSYLVANIA; ASSIGNOR TO THE U. G. I. CONTRACTING COMPANY, OF PHILADELPHIA, PENNSYLVANIAQA CORPORATION F DELAWARE.

PROCESS OF PURIFYING MLUMKNATWG GAS.

Application filed August d, ll. Serial Ito. 95,593.

The purification of illuminating or other gas with powdered or subdivided hydrated iron oxide involves a chemical reaction ef'-` fected by contact between the solid particles 5 and the duid.

One object of the present invention is to improve and make more perfect the process of purifying gas.

The invention alsov comprises the imio. rovements to bel presently described and nally claimed.y i

In the accompanying drawings the appli# cation of the invention to the puricatlon of illuminating gas is illustrated but the in' i vention is `by no means limited to that a plication because the invention is' of wi e application in the arts and industries.

ln the drawings l` is a chamber shown as daring upwardly and outwardly and in no form it'may be likened to a Venturi tube. 2 is an inlet connection for gas which is-to be purified, and as shownit communicates with the smaller `and lower end of the cham ber 3 is an cE-take pipe which communicates with the chamber l as shown at the upper and larger end thereof and the purinedv gas passes through it. '4- is a by-pass connectin the pipes 2 and 3 and it is provided wt a fan or blower 5 driven by a se motor 6 and it affords means for keeping the velocity of the gas, flowing to and away from the chamber 1, constant.v In the chamber 1, as shown, the vellocity of Ythe ascending. stream of gas decreases progressively at dif- 85 ferent levels as the -vessel flares from the' bottom or inlet 2 toward thetop or outlet 3. 7, generally, is a means for introducing hydrated iron oxide in finely divided form tol the stream of gas so that the varying parv to ticles of the hydrated iron oxide under the iniuence of gravity may in diffusion seek and find in the stream of gas various posi-V tions of' retardation at different levels throughout the interior of the chamber 1. The law known among physicists as Stokes law applies'in the case of the present invention. A s shown this means 7 com rises a hopper 8 having a stirrer y9, the fee screw -10 and the jet 11 which is sup lied with purifiedgas. 12 is a motor for d) stirrer and the feed screw. i3 is a hood open at the bottom and into which the particles of solid material are discharged by the jet.

'lhe velocity of the stream of dui-d decreases at diderent ascending levels or strata g A as the stream'rises and increases in crosssect-ion, and` the particles descend against that stream with varying velocities according to their respective size and mass, and in the descent each particle will reach a re- 60,

spective stratum of duid of such velocityA as to greatly reduce the velocity of the particles and give the required time of and diusion for contact and the particles in their further descent continually fall to the @5 bottom of the chamber at a rate largely dependent upon the rapidity of the feed and the initial velocity of the stream of duid. By continuously returning the particles from the bottom to the top or by continuously 10 feeding additional particles to the'top and removingthosc at thebottom the contact reaction may be made continuous.

The conditions above describ are particularly favorable for the pnrication of 'l illuminating and other as and for the reviviication of fouled oxide of iron. ln the specic case under description fouled hy drated oxide of iron, descends to the bottom of the chamber l, from which it maybe removed as by the feed screw le Iactuated by the motor l5, for reviviication and re-use or other suitable disposal. lin the purincation of gas the continuity of the contact reaction in the sameapparatus is of prime industrial e5 importance. y

i It will be obvious to those skilled in the art that'modilications may be made in de- Jtails of procedure without departing from the spirit of the invention which is not 00l limited as to those matters or otherwise than as the prior art and the appended claims may require. c f

I claim:

' 1. The improvement in the rocess of'95 purifying swith subdividedhy rated ironf oxide while consists-in establishing a stream of .gas ascending with decreasing velocity,v and allowing the finely divided iron oxide rivive the" ,to fell by gravity and intoaxiaicounaraow mo' h to -the top of the stream for reuse.

.2. The improvement in' the iroeess of purifying as with subdividedh7 rated iron oxide whlc A consists in establishing a stream K of gas` ascending with decreasing ireloc-ty and allowing the inely divided iron oxide to fall by gravity and mi coaxial counteriow 10 relation with and through `and out at the V bottom lof said stream, -and leading off `the puriied gas. l

EDWAD J. BRADY. 

